/******************************************************************************
 *  Project:		Neddle Community Edition
 *  Filename:		ObjectExtensions.cs
 *	Created By:     Kristopher Cargile <kristopher@neddle.org>
 *  Date Created:	March 29, 2011
 * ****************************************************************************
 * IMPORTANT GNU LICENSE INFORMATION. DO NOT REMOVE THIS SECTION!
 * 
 * Neddle :: Copyright (c) 2010-2012, Cargile Technology Group, LLC
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 ******************************************************************************/

using System;
using System.Linq;

namespace Neddle
{
    /// <summary>
    /// ObjectExtensions
    /// </summary>
    public static class ObjectExtensions
    {
        /// <summary>
        /// Checks parameter for null and throws <code>ArgumentNullException</code> if null.
        /// </summary>
        /// <param name="parm">the parameter to check for null</param>
        /// <exception cref="ArgumentNullException">parm is null</exception>
        public static void CheckNull(this object parm)
        {
            parm.CheckNull(null);
        }

        /// <summary>
        /// Checks parameter for null and throws <code>ArgumentNullException</code> if null.
        /// </summary>
        /// <param name="parm">the parameter to check for null</param>
        /// <param name="parmName">the _name of the parameter</param>
        /// <exception cref="ArgumentNullException">parm is null</exception>
        public static void CheckNull(this object parm, string parmName)
        {
            if (parm == null)
            {
                throw new ArgumentNullException(parmName);
            }
        }

        

        /// <summary>
        /// Convert the value from db to the nullable Type specified
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="param">The param.</param>
        /// <returns></returns>
        public static T ToNullableValueFromDb<T>(this object param)
        {
            if (param == DBNull.Value)
            {
                return default(T);
            }
            Type paramType = typeof(T);
            if (paramType.IsNullable())
            {
                paramType = typeof(T).GetGenericArguments().First();
            }
            return (T)Convert.ChangeType(param, paramType);
        }

        /// <summary>
        /// Convert the value from db to the not-nullable Type specified
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="param">The param.</param>
        /// <returns></returns>
        public static T ToValueFromDb<T>(this object param)
        {
            if (param == DBNull.Value)
            {
                throw new ArgumentNullException("param");
            }
            Type paramType = typeof(T);
            return (T)Convert.ChangeType(param, paramType);
        }

        /// <summary>
        /// Gets the domain type
        /// </summary>
        /// <param name="param">The param.</param>
        /// <returns></returns>
        public static Type GetDomainType(this object param)
        {
            Type type = param.GetType();
            if (type.Name.Contains("Wrapped_"))
            {
                type = type.BaseType;
            }
            return type;
        }

        
    }
}
